00:01
For this question, we can consider the reabsorption and secretion of different substances along the nephron.
00:09
So here we have the bovin's capsule, proximal tubule, loop of henley, distal tubule, and the collecting duct.
00:26
So as you know, the blood vessels are going to feed into bowman's capsule at what we call the glomerulus.
00:32
Feed around the proximal tubule and create a patchwork of arteries to collect reabsorbed substances and help secrete other substances.
00:45
And this network is called the vasorecta.
00:50
So if we consider that we have the most concentrated fluid coming in after filtration at the glomerulus, you're going to have lots of reabsorption at the proximal tubule.
01:05
Any glucose that made it through the glomerulus is going to be reabsorbed.
01:10
You have many amino acids being reabsorbed, as well as any really highly concentrated substance.
01:20
In the descending loop of henley, you're going to have water leaving the tubule, and that's because the concentration of substances increases.
01:33
So you have a high potassium and high sodium as you go lower into the medullary space of the kidney.
01:40
Which is where the loop of henley reaches down into compared to the top...